Tensile Properties at Room Temperature to 823 K of Mg-4Y-3RE Alloy

Abstract

This paper describes tensile properties of a peak-aged Mg–4Y–3RE alloy at room temperature to 823 K with 10⁻⁵–10⁻¹ s⁻¹. The Mg alloy exhibited high strength (> 250 MPa) at room temperature to 473 K . However, the strength rapidly decreased at 573 K . It is suggested that a large decrease in strength at 573 K is attributed to grain boundary sliding. Also, elongation increased rapidly at 723–823 K . This is likely to arise from the relatively high strain rate sensitivity of about 0.3 due to the glide-controlled dislocation creep.